Income Taxes - Reconciliation of Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Tax at statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal benefit	4.00%	3.00%	2.00%
Uncertain tax positions	0.00%	(22.00%)	0.00%
IRS audit resolution	0.00%	11.00%	0.00%
Effect of net income attributable to noncontrolling interests	2.00%	0.00%	0.00%
Change in valuation allowance	12.00%	2.00%	0.00%
Other, net	2.00%	0.00%	0.00%
Income tax expense	55.00%	29.00%	37.00%
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Tax at statutory rate	$ 23,675	$ 47,922	$ 41,968
State taxes, net of federal benefit	2,717	4,357	2,893
Uncertain tax positions	0	(30,961)	0
IRS audit resolution	0	15,505	0
Effect of net income attributable to noncontrolling interests	1,492	0	0
Change in valuation allowance	7,812	2,165	(264)
Other, net	1,276	361	181
Income tax expense	$ 36,972	$ 39,349	$ 44,778